/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/Island/IslandManager.h
void SetParticleIslandIsSleeping ( [FGeometryParticleHandle](API\Runtime\Chaos\Chaos\FGeometryParticleHandle) * Particle, const [bool](API\Runtime\Chaos\Chaos\Collision\Chaos__Private__bool\1) bInIsSleeping )